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Liquid crystal panel, liquid crystal display device including liquid crystal panel, and method of manufacturing liquid crystal panel

a liquid crystal display and liquid crystal technology, applied in semiconductor devices, instruments, optics, etc., can solve the problems of cost increase, reduction in light efficiency, and reduction in light efficiency, and achieve the effect of preferable viewing angle characteristics

Active Publication Date: 2016-03-31
TRIVALE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a liquid crystal panel, a liquid crystal display device including the liquid crystal panel, and a method of manufacturing the liquid crystal panel that can achieve preferable viewing angle characteristics even in the presence of manufacturing variations. This means that the liquid crystal panel can be viewed from a driver's seat or a front passenger's seat of a vehicle and still be clearly visible, without being negatively impacted by any variations in the manufacturing process. The technical effect of the invention is to improve the quality of viewing angles and visual clarity of liquid crystal panels when viewed from a vehicle's driver's seat or front passenger's seat.

Problems solved by technology

Like the techniques disclosed in Japanese Patent Application Laid-Open Nos. 2003-87688 and 2007-47204, simply adding an optical component such as a polarizing plate or a wave plate to a liquid crystal panel for filtering or changing an optical path brings about the following problems.
As an example, adding an optical component to cause filtering action brings about the problem of reduction in efficiency of use of light.
Adding an optical component not to cause filtering action does not bring about the problem of reduction in efficiency of use of light but it brings about the problem of cost increase.
According to a method of compensating for a viewing angle using a phase difference film as a wave plate, failing to make a delay phase axis of the phase difference film as designed due to manufacturing variations or the like results in a deviation from intended optical compensation.
This brings about a problem such as a large deviation of a viewing angle from a range preferable for a liquid crystal display device to be installed on a vehicle.
Thus, a viewing angle has not been optimized by being adjusted finely in a range preferable for a liquid crystal display device to be installed on a vehicle.

Method used

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  • Liquid crystal panel, liquid crystal display device including liquid crystal panel, and method of manufacturing liquid crystal panel
  • Liquid crystal panel, liquid crystal display device including liquid crystal panel, and method of manufacturing liquid crystal panel
  • Liquid crystal panel, liquid crystal display device including liquid crystal panel, and method of manufacturing liquid crystal panel

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first preferred embodiment

[0064]FIG. 1 is a plan view showing the structure of a liquid crystal panel 1 provided in a liquid crystal display device according to a first preferred embodiment of the present invention. FIG. 2 is a sectional view of the liquid crystal panel 1 as viewed from a cutting plane line II-II of FIG. 1.

[0065]The liquid crystal panel 1 shown as an example in FIGS. 1 and 2 adopts an in-plane system operated by using a thin film transistor (abbreviated as TFT) as a switching element. The liquid crystal panel 1 is more specifically a liquid crystal panel adopting a fringe field switching (FFS) system.

[0066]As shown in FIGS. 1 and 2, the liquid crystal panel 1 includes a TFT array substrate (simply called an “array substrate” in some cases) 10, a color filter substrate 20, and a seal material 30.

[0067]Both the array substrate 10 and the color filter substrate 20 are quadrilateral, more specifically rectangular in outer shape. In the first preferred embodiment, the outer shape of the array sub...

second preferred embodiment

[0134]FIG. 8 shows an example of arrangement of optical components of a liquid crystal panel according to a second preferred embodiment of the present invention. The liquid crystal panel of the second preferred embodiment is similar to that of the first preferred embodiment. A structure same as that of the first preferred embodiment is identified by the same reference sign and description common to these structures will not be given repeatedly. In the second preferred embodiment, the direction of the slit portion of the slit electrode, the alignment direction of the liquid crystal molecule 41, the directions of the absorption axes 51 and 54 of the polarizing plates 32a and 32 respectively, and the direction of the delay phase axis 53 of the biaxial phase difference film 32c are the same as those of the first preferred embodiment. Like in the first preferred embodiment, a slit electrode of the second preferred embodiment is the counter electrode 13.

[0135]Like in the first preferred e...

third preferred embodiment

[0143]FIG. 10 shows an example of arrangement of optical components of a liquid crystal panel according to a third preferred embodiment of the present invention. The liquid crystal panel of the third preferred embodiment is similar to those of the first and second preferred embodiments. A structure same as that of the first and second preferred embodiments is identified by the same reference sign and description common to these structures will not be given repeatedly. In the third preferred embodiment, a direction of the slit portion of the slit electrode, the alignment direction of the liquid crystal molecule 41, the direction of the absorption axis 54 of the array substrate polarizing plate 32b, and the direction of the delay phase axis 53 of the biaxial phase difference film 32c are the same as those of the first and second preferred embodiments. Like in the first preferred embodiment, a slit electrode of the third preferred embodiment is the counter electrode 13.

[0144]Like in th...

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Abstract

A pretilt angle of a liquid crystal molecule on the side of an array substrate is formed such that the liquid crystal molecule goes away from the array substrate in a direction to the left when viewed from a position facing a display surface of a liquid crystal panel. The pretilt angle on the side of a counter substrate is formed such that the liquid crystal molecule goes away from the counter substrate in a direction to the right when viewed from a position facing the display surface. The directions to the left and the right define a direction X corresponding to a horizontal direction of the liquid crystal panel. A direction of a delay phase axis of a biaxial phase difference film is arranged in a position rotated anticlockwise in an angular range from over 0° to 1° from the direction X.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a liquid crystal panel, a liquid crystal display device including the liquid crystal panel, and a method of manufacturing the liquid crystal panel.[0003]2. Description of the Background Art[0004]A liquid crystal display device is used for example as a display device of a car navigation system to be installed on a vehicle, for example. The liquid crystal display device installed on a vehicle is viewed from a driver's seat or a front passenger's seat, so that it is inevitably viewed from above. Thus, regarding the liquid crystal display device to be installed on a vehicle, adjusting a viewing angle range is required so as to optimize optical characteristics such as contrast characteristics when the liquid crystal display device is viewed from above.[0005]A technique of adjusting a viewing angle of a liquid crystal display device in a range preferable for a device to be installed on a vehic...

Claims

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Application Information

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IPC IPC(8): G02F1/1343G02F1/1333G02F1/1335G02F1/13363G02F1/1368H01L27/12
CPCG02F1/134309G02F1/1368G02F1/13363G02F2001/134372G02F1/133345H01L27/1259G02F1/133528G02F1/134372G02F1/133634G02F1/133707G02F1/1393G02F1/133531G02F1/133749G02F1/133773
Inventor YONEMURA, KOJIUMEDA, HIROSHIOKUMOTO, KAZUNORI
Owner TRIVALE TECH
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